package crypto.attack.differential.higher.data;

import crypto.util.ExtendedFunctionType;

/**
 * @author Isaac
 * 
 */
public class bfDES implements ExtendedFunctionType {
	private static final int[] SB1 = { 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6,
			12, 5, 9, 0, 7, 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3,
			8, 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, 15, 12, 8,
			2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 };
	private static final int[] SB2 = { 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13,
			12, 0, 5, 10, 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
			0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, 13, 8, 10, 1,
			3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 };
	private static final int[] SB3 = { 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7,
			11, 4, 2, 8, 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
			13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, 1, 10, 13, 0,
			6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 };
	private static final int[] SB4 = { 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5,
			11, 12, 4, 15, 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14,
			9, 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, 3, 15, 0,
			6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 };
	private static final int[] SB5 = { 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15,
			13, 0, 14, 9, 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
			4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, 11, 8, 12, 7,
			1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 };
	private static final int[] SB6 = { 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4,
			14, 7, 5, 11, 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
			9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, 4, 3, 2, 12,
			9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 };
	private static final int[] SB7 = { 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7,
			5, 10, 6, 1, 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
			1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, 6, 11, 13, 8,
			1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 };
	private static final int[] SB8 = { 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14,
			5, 0, 12, 7, 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
			7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, 2, 1, 14, 7,
			4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 };

	private static int inputLength = 6;
	private static int outputLength = 4;
	private int s;

	public bfDES(int s) {
		this.s = s;
	}

	public int calc(int input) {
		int t = ((input & 0x20) | (input & 1) << 4) | (input & 0x1e) >> 1;
		switch (s) {
		case 1:
			return SB1[t];
		case 2:
			return SB2[t];
		case 3:
			return SB3[t];
		case 4:
			return SB4[t];
		case 5:
			return SB5[t];
		case 6:
			return SB6[t];
		case 7:
			return SB7[t];
		case 8:
			return SB8[t];
		default:
			return SB1[t];
		}
	}

	public int getInputLength() {
		return inputLength;
	}

	public int getOutputLength() {
		return outputLength;
	}

	public static void main(String[] args) {
		new bfDES(1);
	}
}
